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Generics

Generic Functions

Master generic function declarations, generic arrow functions, type inference in generic calls, and generic array utilities in TypeScript.

Last Updated: July 29, 2026 • 10 min read

A Generic Function is a function that uses type parameters to declare relationships between parameter types, return types, or internal variable types.

1. Syntax for Generic Functions

Declare generic parameters inside angle brackets before the function parameter list:

2. Generic Arrow Functions

Generic parameters can be attached to arrow functions:

3. Multiple Generic Parameters in Functions

Functions can accept multiple type variables separated by commas:

4. Interactive Code Playground

Test generic functions below:

5. Summary Checklist

  • [x] Declare generic type parameters in before function arguments.
  • [x] Rely on TypeScript's call-argument type inference whenever possible.
  • [x] In .tsx files, write for generic arrow functions to prevent JSX conflicts.